linux-kernel - [PATCH v2] drm/panel/panel-tpo-tpg110: fix a possible null pointer dereference

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Message-Id: <20231009090446.4043798-1-make_ruc2021@163.com>
Date:   Mon,  9 Oct 2023 17:04:46 +0800
From:   Ma Ke <make_ruc2021@....com>
To:     linus.walleij@...aro.org, neil.armstrong@...aro.org,
        sam@...nborg.org, airlied@...il.com, daniel@...ll.ch
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Ma Ke <make_ruc2021@....com>
Subject: [PATCH v2] drm/panel/panel-tpo-tpg110: fix a possible null pointer dereference

In tpg110_get_modes(), the return value of drm_mode_duplicate() is
assigned to mode, which will lead to a NULL pointer dereference on
failure of drm_mode_duplicate(). Add a check to avoid npd.

Signed-off-by: Ma Ke <make_ruc2021@....com>
---
 drivers/gpu/drm/panel/panel-tpo-tpg110.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-tpo-tpg110.c b/drivers/gpu/drm/panel/panel-tpo-tpg110.c
index 845304435e23..f6a212e542cb 100644
--- a/drivers/gpu/drm/panel/panel-tpo-tpg110.c
+++ b/drivers/gpu/drm/panel/panel-tpo-tpg110.c
@@ -379,6 +379,8 @@ static int tpg110_get_modes(struct drm_panel *panel,
 	connector->display_info.bus_flags = tpg->panel_mode->bus_flags;
 
 	mode = drm_mode_duplicate(connector->dev, &tpg->panel_mode->mode);
+	if (!mode)
+		return -ENOMEM;
 	drm_mode_set_name(mode);
 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 
-- 
2.37.2